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Thanks alot to everybody!
Do I need the Jam Nut even if I have a Z2 instead of a Z2X (so, without swivel)?
those guys have more experience with Atomic than I do, but you can always call an Atomic service tech if you're really concerned about the jam nut. Do learn something new every day though, had no idea the Atomics needed that jam nut for the swivels, strange they made theirs with longer threads than standard connections, wonder if it was to prevent people using them on other second stages....